CN104550797B - A kind of hypoergia crystallizer protecting residue of rare earth steel continuous casting - Google Patents
A kind of hypoergia crystallizer protecting residue of rare earth steel continuous casting Download PDFInfo
- Publication number
- CN104550797B CN104550797B CN201510016163.3A CN201510016163A CN104550797B CN 104550797 B CN104550797 B CN 104550797B CN 201510016163 A CN201510016163 A CN 201510016163A CN 104550797 B CN104550797 B CN 104550797B
- Authority
- CN
- China
- Prior art keywords
- rare earth
- continuous casting
- crystallizer protecting
- sio
- hypoergia
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Continuous Casting (AREA)
Abstract
The hypoergia crystallizer protecting residue of a kind of rare earth steel continuous casting, composition is by weight percentage containing Li2O 5 ~ 20%, Ce2O35 ~ 20%, SiO22 ~ 10%, remaining is CaO and Al2O3, and CaO and Al2O3Mass ratio be 0.5 ~ 1.5, impurity≤10%；Granularity accounts for total amount more than 80% in the part of 200 mesh；Fusion temperature is 1050 ~ 1235 DEG C, and viscosity when 1300 DEG C is 0.15 ~ 0.48 Pa s, and surface tension when 1350 DEG C is 0.24 ~ 0.53N/m.The crystallizer protecting residue of the present invention has suitable viscosity, surface tension and fusion temperature, it is possible to the reaction between suppression molten steel rare earth elements and covering slag constituent element effectively, improves the effect of rare earth steel continuous casting crystallining.
Description
Technical field
The invention belongs to metallurgical technology field, particularly to the hypoergia crystallizer protecting residue of a kind of rare earth steel continuous casting.
Background technology
It is known that, rare earth in steel can effectively play cleaning molten steel, going bad is mingled with the effect with microalloying, the application of rare earth in steel is continuously available extension, the kind of rare earth micro alloyed steel and Rare Earth Treated Steel gets more and more, such as 09CuPTiRE weathering steel, 310 high-strength weathering Yi shape steels, BNbRE Properties of Heavy Rail Steel, BVRE Properties of Heavy Rail Steel etc., wheel steel etc..Owing to trace rare-earth can significantly improve the high-temperature oxidation resistance of steel, elevated temperature strength and thermoplasticity, rare earth application in heat resisting steel gets more and more, such as serial rare-earth heat resisting steel such as S30815, S31060, S34800.Rare earth in molten steel is extremely active, for ensureing that the content of rare earth reaches steel grades requirement, needs excess to add rare earth, and the addition scope of rare earth is 0.01% ~ 1.0%.
Continuous crystallizer protecting slag is powder or graininess, is one of main steel-making auxiliary material；In casting process, it is covered in above crystallizer molten steel, form slag layer, sinter layer and liquid slag layer from top to bottom, effectively play adiabatic heat-insulation, isolation air prevents molten steel secondary oxidation, absorb field trash in molten steel, lubrication strand and control the metallurgical functions such as Billet；Can the metallurgical function of above-mentioned crystallizer protecting residue stably play, and improves continuous casting process direct motion and slab quality and has important impact.If covering slag performance is bad, easily cause the surface defect such as slag inclusion and crackle, bleed-out accident can occur time serious.
Conventional continuous crystallizer protecting slag composition is predominantly located at CaO-Al2O3-SiO2With wollastonite (CaO SiO in ternary system2) it is main low melting point region, CaO is about 30% ~ 50%, SiO2It is 45% ~ 60%, Al2O3< 20%, fusion temperature is at 1300 ~ 1500 DEG C；Additionally, be also added with CaF in covering slag base-material2、Na2O、K2O、Li2O、B2O3, the auxiliary material such as BaO as flux, play the effect fluxed.Burn-off rate for regulation covering slag is also added with carbonaceous material.
Conventional continuous crystallizer protecting slag is not particularly suited for the casting cycle of rare earth steel；One of reason is, the chemical property of rare earth is active, and easily with element formation rare earth oxide or the rare earth oxysulfide such as the oxygen in molten steel, sulphur, in the casting cycle of rare earth steel, in molten steel, a large amount of dystectic re inclusions float up to slag gold interface；If covering slag is limited to its absorbent properties, then a large amount of rare earth oxides and rare earth oxysulfide are mingled with and will assemble in slag gold interface, and cause slag bar, the formation of slag circle, have a strong impact on the lubrication of covering slag, heat transfer property, thus cause the generation of surface defect of bloom.
The re inclusion assembled due to slag gold interface enters in liquid covering slag; change the physical and chemical performance of continuous casting covering slag; its melting conditions is made to be deteriorated; viscosity increases; causing the slag film between strand and crystallizer thinning, even local is without slag, is deteriorated the lubricity of strand; thus cause slab surface crack to increase, cause the probability of sticker type breakout to increase.
In casting process, the molten steel in crystallizer directly contacts with melted covering slag, and owing to the reproducibility of rare earth is extremely strong, the slag gold interfacial reaction in crystallizer is the most serious.Rare earth in molten steel easily with the SiO in covering slag2、Na2The constituent elements such as O react, and make the composition of covering slag change, and the metallurgical function of covering slag deteriorates；Therefore, the reactivity reducing rare earth steel continuous crystallizer protecting slag becomes one of problem needing solution badly.
About controlling the impact on covering slag performance of the continuous cast mold impeller in slurry pump, relevant measure proposes in the patents such as JP2005152973, CN200810039377.2, and its solution is for increasing SiO in initial covering slag2Content so that it is occurring after slag gold interfacial reaction is reduced, overall composition changing ratio is less；But theory analysis shows, increase initial SiO2Content increases the reaction tendency of rare earth and covering slag constituent element on the contrary, is unfavorable for the slag gold interfacial reaction in suppression crystallizer, and the method is poor effect when casting rare earth steel.
The patents such as JP2003181606, JP2006110578, CN200710042540.6 of having reported, propose to increase basicity, reduce SiO in initial covering slag2Content, effectively to reduce impeller in slurry pump performance.But still need to add the Na of high level2O、CaF2Deng flux；Na2O relatively SiO2It is more easy to react with the rare earth in molten steel, increases slag gold interfacial reaction trend；Additionally, add high level containing F constituent element, easily cause the pollution to water body and air, increase environmental pressure.
Conventional continuous crystallizer protecting slag can not meet the requirement that rare earth steel continuous casting produces, and exploitation has the rare earth steel continuous crystallizer protecting slag of less reactive and good re inclusion solution absorption performance and has important practical significance.
Summary of the invention
The problems referred to above existed for existing rare earth steel crystallizer protecting cinder for continuous casting technology; the present invention provides the hypoergia crystallizer protecting residue of a kind of rare earth steel continuous casting; by adjusting the composition of covering slag; make it have suitable viscosity, surface tension and fusion temperature, it is possible to increase the effect of rare earth steel continuous casting crystallining.
The composition of the hypoergia crystallizer protecting residue of the rare earth steel continuous casting of the present invention is by weight percentage containing Li2O 5 ~ 20%, Ce2O35 ~ 20%, SiO22 ~ 10%, remaining is CaO and Al2O3, and CaO and Al2O3Mass ratio be 0.5 ~ 1.5, granularity accounts for total amount more than 80% in the part of-200 mesh.
The fusion temperature of the hypoergia crystallizer protecting residue of above-mentioned rare earth steel continuous casting is 1050 ~ 1235 DEG C, and viscosity when 1300 DEG C is 0.15 ~ 0.48 Pa s, and surface tension when 1350 DEG C is 0.24 ~ 0.53N/m.
The hypoergia crystallizer protecting residue of above-mentioned rare earth steel continuous casting when 1450 DEG C, SiO in slag system2Activity be 3.56 × 10-5~1.56×10-3, Ce2O3Activity be 2.50 × 10-3~7.29×10-2；When 1500 DEG C, SiO in slag system2Activity be 2.77 × 10-5~1.9×10-3, Ce2O3Activity be 3.51 × 10-3~9.37×10-2。
The preparation method of the hypoergia crystallizer protecting residue of the rare earth steel continuous casting of the present invention is:
Prepare CaO, Al2O3、SiO2、Li2CO3And Ce2(CO3)3As raw material, Li2CO3Consumption press Li2O counts, Ce2(CO3)3Consumption press Ce2O3Meter；Whole raw materials are heated to 1400 ± 10 DEG C of high temperature fritting, Li2CO3It is decomposed into Li2O, Ce2(CO3)3It is decomposed into Ce2O3, then shrend, then drying and dehydrating, then sieve, it is thus achieved that the hypoergia crystallizer protecting residue of rare earth steel continuous casting.
The hypoergia crystallizer protecting residue of the rare earth steel continuous casting of the present invention can effectively suppress the impeller in slurry pump of casting process, the principle of its composition design to be:
Interval, according to CaO-Al for ensureing that crystallizer protecting residue has suitable liquid phase2O3Phasor, whenw(CaO)/w(Al2O3) when being about 0.94, there is low melting point 12CaO 7Al2O3Phase；CaO-Al is drawn according to utilizing thermodynamic software Factsage2O3-SiO2Isollaothermic chart, yet suffers from low melting point region in high calcium high alumina district, and this region is using the one-tenth component selections reference area of the slag system as the present invention, to reduce its reactivity worth；From above two figures,w(SiO2) < 10%,w(CaO)/w(Al2O3) ≈ 0.5 ~ 1.5 time, there is low-melting-point material phase or low melting point region；Therefore the present invention draftsw(CaO)/w(Al2O3) in the range of 0.5 ~ 1.5；
Li2O is the main fluxing of the slag system of the present invention, it is reported that, Li2O content often increases by 1%, and fusion temperature reduces by 60 DEG C, and in the slag system of the present invention, it mainly plays reduction covering slag fusion temperature and the effect of viscosity；Owing to the slag system of the present invention is not added with relatively Li2O is more easy to the Na reduced by molten steel rare earth elements2O、K2O and the CaF of non-environment-friendly type2Deng flux, therefore, Li2The addition of O increases；By Li2O-Al2O3Phasor understands, at Li2O and Al2O3When mass ratio is about 1, there is low melting point region, therefore, slag system composition, with reference to this composition, is made suitably adjustment, is worked as Li by the slag system of the present invention2O addition is the most suitable when being 5 ~ 20%；Further, Li2O is replaced by cheap lithium carbonate resource, prepares in fritting decomposable process；
Ce2O3For one of major components suppressing slag gold interfacial reaction in the slag system of the present invention, it is added into increasing the activity of product, thus effectively suppresses the molten steel rare earth elements shown in following formula and the reaction between covering slag constituent element；And, according to CaO-AlO1.5-CeO1.5System Feo-feo figure, Ce2O3Scope be defined as 5 ~ 20%, the most stable to ensure that the slag system of the present invention absorbs property retention after rare earth oxide.
Reaction equation between above-mentioned molten steel rare earth elements and covering slag constituent element is:
2x[RE]+y(SiO2)=y[Si]+2(RExOy)
；
In formula,WithIt is respectively [Si] and the activity of [RE] in molten steel；WithIt is respectively SiO in slag2And RExOyActivity.
Utilize thermodynamic software Factsage that the activity of related components in covering slag is calculated, SiO in the hypoergia crystallizer protecting residue of rare earth steel continuous casting2There is relatively low activity, Ce2O3There is higher activity；This slag system has relatively low reactivity.
Accompanying drawing explanation
Fig. 1 is the response curve of common constituent element in molten steel rare earth elements and covering slag；
Fig. 2 is CaO-Al2O3Phasor；
Fig. 3 is the CaO-Al utilizing thermodynamic software Factsage to draw2O3-SiO2The isollaothermic chart of system；
Fig. 4 is Li2O-Al2O3The phasor of system；
Fig. 5 is CaO-AlO1.5-CeO1.5The liquid phase interval graph of system；In figure, L is that liquid phase is interval.
Detailed description of the invention
The material purity used in the embodiment of the present invention is all >=99%.
The embodiment of the present invention is tested viscosity and surface tension uses high-temperature fusant physical property comprehensive tester (being respectively adopted rotating cylinder method and hollow cylinder method).
The embodiment of the present invention is tested fusing point and uses fusing point molten speed analyzer (half ball).
The embodiment of the present invention use thermodynamic software Factsage the activity of related components in covering slag is calculated.
Embodiment 1
The composition of the hypoergia crystallizer protecting residue of rare earth steel continuous casting is by weight percentage containing Li2O
10%, Ce2O310%, SiO210%, remaining is CaO and Al2O3, and CaO and Al2O3Mass ratio be 0.5, granularity accounts for total amount more than 80% in the part of-200 mesh；Fusion temperature is 1176 DEG C, and viscosity when 1300 DEG C is 0.32 Pa s, and surface tension when 1350 DEG C is 0.32N/m；When 1450 DEG C, SiO in slag system2Activity be 1.56 × 10-3, Ce2O3Activity be 2.50 × 10-3；When 1500 DEG C, SiO in slag system2Activity be 1.90 × 10-3, Ce2O3Activity be 3.15 × 10-3；
Preparation method is: prepare CaO, Al2O3、SiO2、Li2CO3And Ce2(CO3)3As raw material, Li2CO3Consumption press Li2O counts, Ce2(CO3)3Consumption press Ce2O3Meter；Whole raw materials are heated to 1400 ± 10 DEG C of high temperature fritting, Li2CO3It is decomposed into Li2O, Ce2(CO3)3It is decomposed into Ce2O3, then shrend, then drying and dehydrating, then sieve.
Embodiment 2
The composition of the hypoergia crystallizer protecting residue of rare earth steel continuous casting is by weight percentage containing Li2O
10%, Ce2O315%, SiO23%, remaining is CaO and Al2O3, and CaO and Al2O3Mass ratio be 1.5, granularity accounts for total amount more than 80% in the part of-200 mesh；Fusion temperature is 1223 DEG C, and viscosity when 1300 DEG C is 0.36 Pa s, and surface tension when 1350 DEG C is 0.53N/m；When 1450 DEG C, SiO in slag system2Activity be 3.56 × 10-5~6.24×10-4, Ce2O3Activity be 7.29 × 10-2；When 1500 DEG C, SiO in slag system2Activity be 2.77 × 10-5, Ce2O3Activity be 9.37 × 10-2；
Preparation method is with embodiment 1.
Embodiment 3
The composition of the hypoergia crystallizer protecting residue of rare earth steel continuous casting is by weight percentage containing Li2O
15%, Ce2O35%, SiO26%, remaining is CaO and Al2O3, and CaO and Al2O3Mass ratio be 1.0, granularity accounts for total amount more than 80% in the part of-200 mesh；Fusion temperature is 1105 DEG C, and viscosity when 1300 DEG C is 0.26 Pa s, and surface tension when 1350 DEG C is 0.24N/m；When 1450 DEG C, SiO in slag system2Activity be 3.51 × 10-4, Ce2O3Activity be 8.30 × 10-3；When 1500 DEG C, SiO in slag system2Activity be 4.54 × 10-4, Ce2O3Activity be 9.76 × 10-3；
Preparation method is with embodiment 1.
Embodiment 4
The composition of the hypoergia crystallizer protecting residue of rare earth steel continuous casting is by weight percentage containing Li2O
5%, Ce2O320%, SiO22%, remaining is CaO and Al2O3, and CaO and Al2O3Mass ratio be 0.8, granularity accounts for total amount more than 80% in the part of-200 mesh；Fusion temperature is 1235 DEG C, and viscosity when 1300 DEG C is 0.46 Pa s, and surface tension when 1350 DEG C is 0.36N/m；When 1450 DEG C, SiO in slag system2Activity be 1.66 × 10-4, Ce2O3Activity be 9.70 × 10-3；When 1500 DEG C, SiO in slag system2Activity be 1.76 × 10-4, Ce2O3Activity be 1.28 × 10-2；
Preparation method is with embodiment 1.
Embodiment 5
The composition of the hypoergia crystallizer protecting residue of rare earth steel continuous casting is by weight percentage containing Li2O
20%, Ce2O35%, SiO210%, remaining is CaO and Al2O3, and CaO and Al2O3Mass ratio be 1.2, granularity accounts for total amount more than 80% in the part of-200 mesh；Fusion temperature is 1050 DEG C, and viscosity when 1300 DEG C is 0.15 Pa s, and surface tension when 1350 DEG C is 0.51N/m；When 1450 DEG C, SiO in slag system2Activity be 9.77 × 10-4, Ce2O3Activity be 6.23 × 10-3；When 1500 DEG C, SiO in slag system2Activity be 9.77 × 10-4, Ce2O3Activity be 6.15 × 10-3；
Preparation method is with embodiment 1.
Embodiment 6
The composition of the hypoergia crystallizer protecting residue of rare earth steel continuous casting is by weight percentage containing Li2O
10%, Ce2O315%, SiO25%, remaining is CaO and Al2O3, and CaO and Al2O3Mass ratio be 0.9, granularity accounts for total amount more than 80% in the part of-200 mesh；Fusion temperature is 1176 DEG C, and viscosity when 1300 DEG C is 0.48 Pa s, and surface tension when 1350 DEG C is 0.36N/m；When 1450 DEG C, SiO in slag system2Activity be 3.51 × 10-4, Ce2O3Activity be 8.30 × 10-3；When 1500 DEG C, SiO in slag system2Activity be 4.22 × 10-4, Ce2O3Activity be 1.00 × 10-2；
Preparation method is with embodiment 1.
Claims (4)
1. a hypoergia crystallizer protecting residue for rare earth steel continuous casting, composition is by weight percentage containing Li2O 5 ~ 20%, Ce2O3
5 ~ 20%, it is characterised in that by weight percentage possibly together with SiO22 ~ 10%, remaining is CaO and Al2O3, and CaO and Al2O3Mass ratio be 0.5 ~ 1.5, impurity≤10%；Granularity accounts for total amount more than 80% in the part of-200 mesh.
The hypoergia crystallizer protecting residue of a kind of rare earth steel continuous casting the most according to claim 1; the fusion temperature that it is characterized in that this crystallizer protecting residue is 1050 ~ 1235 DEG C; viscosity when 1300 DEG C is 0.15 ~ 0.48 Pa s, and surface tension when 1350 DEG C is 0.24 ~ 0.53N/m.
The hypoergia crystallizer protecting residue of a kind of rare earth steel continuous casting the most according to claim 1, it is characterised in that this crystallizer protecting residue when 1450 DEG C, SiO in slag system2Activity be 3.56 × 10-5~1.56×10-3, Ce2O3Activity be 2.50 × 10-3~7.29×10-2；When 1500 DEG C, SiO in slag system2Activity be 2.77 × 10-5~1.9×10-3, Ce2O3Activity be 3.51 × 10-3~9.37×10-2。
4. the preparation method of the hypoergia crystallizer protecting residue of the rare earth steel continuous casting described in a claim 1, it is characterised in that: prepare CaO, Al2O3、SiO2、Li2CO3And Ce2(CO3)3As raw material, Li2CO3Consumption press Li2O counts, Ce2(CO3)3Consumption press Ce2O3Meter；Whole raw materials are heated to 1400 ± 10 DEG C of high temperature fritting, Li2CO3It is decomposed into Li2O, Ce2(CO3)3It is decomposed into Ce2O3, then shrend, then drying and dehydrating, then sieve, it is thus achieved that the hypoergia crystallizer protecting residue of rare earth steel continuous casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510016163.3A CN104550797B (en) | 2015-01-13 | 2015-01-13 | A kind of hypoergia crystallizer protecting residue of rare earth steel continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510016163.3A CN104550797B (en) | 2015-01-13 | 2015-01-13 | A kind of hypoergia crystallizer protecting residue of rare earth steel continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104550797A CN104550797A (en) | 2015-04-29 |
| CN104550797B true CN104550797B (en) | 2016-08-31 |
Family
ID=53068460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510016163.3A Active CN104550797B (en) | 2015-01-13 | 2015-01-13 | A kind of hypoergia crystallizer protecting residue of rare earth steel continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104550797B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105834383A (en) * | 2016-06-16 | 2016-08-10 | 东北大学 | Casting powder for aluminate series crystallizer for rare earth heat resistant steel continuous casting and preparing method of casting powder |
| CN106041006A (en) * | 2016-08-10 | 2016-10-26 | 中南大学 | Continuous casting tundish covering agent of Mn-containing and Al-containing steel and application thereof |
| CN110614351B (en) * | 2019-10-30 | 2021-05-18 | 江苏理工学院 | Continuous casting covering slag for stainless steel and preparation method thereof |
| CN113418954B (en) * | 2021-05-21 | 2024-07-19 | 包头钢铁（集团）有限责任公司 | Method for judging performance stability of casting powder in rare earth steel casting process |
| CN114029462B (en) * | 2021-11-15 | 2023-03-28 | 东北大学 | Rare earth oxide-containing continuous casting mold flux for high-titanium low-aluminum steel and preparation method thereof |
| CN113857448B (en) * | 2021-11-29 | 2022-02-22 | 东北大学 | Low-alkalinity coating-free protective slag for continuous casting of hot forming steel |
| CN115026249B (en) * | 2022-05-23 | 2024-02-09 | 首钢京唐钢铁联合有限责任公司 | Covering slag for producing low-carbon steel with high pulling speed of sheet billet and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1696110A1 (en) * | 1989-02-06 | 1991-12-07 | Мариупольский металлургический комбинат им.Ильича | Slag forming mixture |
| JP2007290002A (en) * | 2006-04-25 | 2007-11-08 | Nippon Steel Corp | Heat insulating material for molten steel surface and method for continuously casting steel using the same |
| CN101612653A (en) * | 2008-06-23 | 2009-12-30 | 宝山钢铁股份有限公司 | Mold powder for continuous casting of high aluminium-titanium-rare earth steel |
| CN103128240A (en) * | 2011-11-28 | 2013-06-05 | 上海梅山钢铁股份有限公司 | Low carbon steel continuous casting crystallizer casting powder |
| CN103308547A (en) * | 2013-05-27 | 2013-09-18 | 内蒙古包钢钢联股份有限公司 | Method for judging dissolving property of crystallizer casting slag to rare earth oxide |
-
2015
- 2015-01-13 CN CN201510016163.3A patent/CN104550797B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1696110A1 (en) * | 1989-02-06 | 1991-12-07 | Мариупольский металлургический комбинат им.Ильича | Slag forming mixture |
| JP2007290002A (en) * | 2006-04-25 | 2007-11-08 | Nippon Steel Corp | Heat insulating material for molten steel surface and method for continuously casting steel using the same |
| CN101612653A (en) * | 2008-06-23 | 2009-12-30 | 宝山钢铁股份有限公司 | Mold powder for continuous casting of high aluminium-titanium-rare earth steel |
| CN103128240A (en) * | 2011-11-28 | 2013-06-05 | 上海梅山钢铁股份有限公司 | Low carbon steel continuous casting crystallizer casting powder |
| CN103308547A (en) * | 2013-05-27 | 2013-09-18 | 内蒙古包钢钢联股份有限公司 | Method for judging dissolving property of crystallizer casting slag to rare earth oxide |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104550797A (en) | 2015-04-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104550797B (en) | A kind of hypoergia crystallizer protecting residue of rare earth steel continuous casting | |
| CN108127094B (en) | A kind of non-reacted covering slag of high titanium steel | |
| CN101658907B (en) | Protective slag of large-profile round billet continuous-casting crystallizer and method for preparing same | |
| CN102002556B (en) | Rare earth oxide-containing steelmaking refining slag, and preparation method and using method thereof | |
| CN100584487C (en) | Preparation Preliminary melting type continuous casting crystallizer protecting slag | |
| CN105834383A (en) | Casting powder for aluminate series crystallizer for rare earth heat resistant steel continuous casting and preparing method of casting powder | |
| CN105562641B (en) | A kind of high manganese crystallizer casting powder for high-aluminum steel continuous casting and preparation method thereof | |
| CN104226947B (en) | A kind of tundish covering flux used for ultra-low-carbon steel | |
| CN100443215C (en) | Protective slag for ultralow carbon steel continuous casting | |
| CN110682027B (en) | Electric welding rod with seamless welding core for high-manganese austenite low-temperature steel and preparation method | |
| CN101254526B (en) | Special-shaped billet casting machine continuous casting weathering steel crystallizer protection slag | |
| CN102744380B (en) | Boron-steel-containing mold flux dedicated for continuous casting | |
| CN103273222B (en) | High-strength high-tenacity sintered flux for afterheat-free welding | |
| CN103128243B (en) | High aluminum steel special continuous casting crystallizer casting powder | |
| CN104128578B (en) | Environment-friendly type high alumina peritectic steel continuous crystallizer protecting slag | |
| CN103551537A (en) | Ultra-low-carbon steel and low-carbon steel crystallizer mold flux for continuous casting of automobile sheet and preparation method thereof | |
| CN108160960A (en) | A kind of 400 stainless steel continuous crystallizer protecting slags | |
| CN105935750A (en) | Continuous casting protective slag for high-boron steel | |
| CN101486587B (en) | Double-layer tundish covering agent | |
| CN101745616B (en) | Carbon alloy structure steel continuous casting crystallizer function protection material in stainless steel rectangular billet | |
| CN104858381A (en) | Novel aluminum steel continuous casting tundish covering agent and application thereof | |
| CN102009146B (en) | Carbon steel continuous casting powder in phi 700-800mm round billet | |
| CN102009144A (en) | Function protection material for special continuous casting mould of high-speed heavy rail steel with bloom | |
| CN110315038B (en) | Crystallizer casting powder capable of preventing slag entrapment and application thereof | |
| CN105414505A (en) | Special covering slag for auto sheet CSP sheet billet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |